Process For Introducing An Additive Into A Polymer Melt
AssigneeCurwood, Inc.
InventorsKevin Philip Nelson, Dan G. Siegel
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Abstract
A process includes introducing a base polymer into an extruder, heating to a temperature sufficient to form a polymer melt, introducing a liquid comprising water and at least one additive consisting of an NO donating compound with mixing and subsequent vaporization and venting of the liquid to produce an extrudate having a uniform distribution of preferably uniformly small additive particles.
Claims33
A process comprising:
- a) introducing at least one base polymer into an extruder;
- b) heating the base polymer to a temperature sufficient to form a polymer melt;
- c) introducing into the extruder a liquid comprising water and at least one additive;
- wherein the additive is an NO donating compound;
- d) mixing the liquid with the polymer melt in the extruder to form a blend;
- e) vaporizing at least a portion of the liquid and removing it from the polymer melt;
- and
- f) extruding the additive containing polymer through an extruder die.
The process of claim wherein the polymer is heated to a temperature above about 275° F.
The process of claim 26 wherein the extruder includes a vent located at a position downstream from the injection port, further comprising venting vapor through the vent.
The process of claim 27 further comprising providing at least restriction device downstream of the base polymer feed port and upstream of the solution feed port.
Dependencies are inferred from the claim text.